My guy radar sucks?

I am attracted to a guy that I work with (honestly I’m at a point in my life where if it happens it happens and if it doesn’t it doesn’t you know?)... I feel weird around him, there’s been a few moments where we would be in a group and our eyes would catch each other or that I’d catch him looking at me and then glance away, there’s been a lot of exchanges but we’ve been distant. Other than that I’m the only one that he doesn’t come to talk to (every other new colleagues he talks and jokes with them easily but he never comes to me.. not like he’s obligated to anyway). It’s just that I don’t know what to think about it, I’m always very approaching and I keep greeting him and trying to get a conversation with him and everything but nothing... Girls, have you ever had this problem? Guys, for what reason would push you to act like that?
My guy radar sucks?
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